That's definitely true. Shipping sucks..... I'm fortunate enough to live right on the border so I get all my parts shipped to a handling company in Washington and just go down to pick them up. Saves a TON of money.
HBS is a vendor on the forum. You could talk to them and find out what kind of deals they could give you. As far as I know TGC is not.... As far as the RCX kit goes I'm not sure if Bully's Performance stocks their leveling kits or not. Either Andrew or Jeremiah are great guys to talk to about that though. They will help you out with any aftermarket parts you want to get for your truck.